Update README.md

Changes to the file:
1. Use case description given.
2. One more example related to another part of the use-case added

Author: Soumyadeep10

Client-Side Components/Catalog Client Script/Return Date Validation/README.md

@@ -1,15 +1,23 @@
-This piece of code runs in an OnChange catalog client script for the field 'u_return_date' and validates the return date(u_return_date) in a ServiceNow Catalog item form to ensure:
+This piece of code was written as a part of an usecase where the return date value validation was expected to be after start date as well as within 6 months from the start date. This code runs in an OnChange catalog client script for the field 'u_return_date' and validates the return date(u_return_date) in a ServiceNow Catalog item form to ensure:
 
 1. A start date(u_start_date) is entered before setting a return date(u_return_date).
 2. The return date is within 6 months after the start date.
-3. Return date is not the start date or before that.
+3. Return date must be after the start date, it can't be same as it or before it.
 
 Let’s say with an example:
 
+a)
   u_start_date = 2025-10-01
   You enter u_return_date = 2026-04-15
 
   Steps:
   a)Difference = 196 days → More than 180 days
   b)Result: u_return_date is cleared and error shown: “Select Return Date within 6 months from Start Date”
 
+b)
+  u_start_date = 2025-10-02
+  You enter u_return_date = 2025-10-01
+  
+  Steps:
+  a)Difference = -1 day → Return date put as 1 day before start date
+  b)Result: u_return_date is cleared and error shown: “Select Return Date in future than Start Date”